4 
WuHurE.] CARBONIFEROUS FOSSILS. 161 
in vol. v, Hlinois Geological Reports; but it differs from that species in 
having the base of the calyx concave instead of protuberant, in the pro- 
portions of the calyx, the comparative shortness of the arms, and in 
wanting the peculiar geniculation of the pieces of the double series com- 
posing the arms of that species. Itresembles P. levis Miller, as figured 
by de Koninck & Le Hon on plate vi, Recherches sur les. Crinoides du 
Terraine Carbonifére de la Belgique, but it differs in having only two 
instead of three primary radial pieces to each ray, and also in other de- 
tails of structure. 
Position and locality—Subearboniferous strata; probably equivalent 
with those of the Keokuk division, Bono, Lawrence County, Ind. 
Genus SCAPHIOCRINUS Hall. 
~ SCAPHIOCRINUS GIBSONI White. 
Plate 40, fig. 4 a. 
Scaphiocrinus gibsont White, 1878, Proc. Acad. Nat. Sci. Philad., p. 31. 
Body small or not above medium size for a species of this genus; calyx 
roughly cup-shaped, the pieces composing it moderately thick and pro- 
tuberant, especially the first radial, subradial, and first anal pieces; base 
small, nearly or quite covered by the first joint of the column; subradial 
pieces comparatively large, tumid; first radial pieces broader, but 
scarcely larger than the subradials; sutures between the pieces of the 
calyx impressed, especially at the points where the angles meet, and 
where there are pit-like depressions, which increase the tumid appearance 
of the pieces and give the calyx a somewhat shriveled aspect; anal 
spare comparatively large. The postero-lateral rays consist of three 
pieces, including the first radials, and upon each of the third radials the 
first bifurcation of the ray takes place, and above this the posterior sec- 
ondary division of the ray only bifurcates, this third bifurcation taking 
place on the eighth piece above the second bifurcation, giving five sim- 
ple arms for each of the postero-lateral rays beyond all the bifurcations. 
All the pieces of the rays, including those of both the primary and sub- 
ordinate divisions, have a tendency to become angular upon the back, 
especially at the upper side of each. This, together with the apparent 
corrugation of the calyx and the zigzag articulation of the joints of the 
arms hear their upper ends, gives the whole specimen a good degree of 
asperity of aspect, which, however, the artist has not fully represented 
in the figure on plate 40. Pinnules strong and somewhat angular, one 
arising from each joint of the arms and subordinate divisions of the rays, 
upon alternate sides of the joints. The other rays are not fully known, 
but they apparently bifurcate in nearly the same manner as the postero- 
lateral ones. Column moderately large, composed of irregularly alter- 
nating larger and smaller pieces. ‘he whole surface of body, arms, and 
column minutely but distinctly granular, as seen under a lens. 
Breadth of body, 7 millimeters; height of the same from base to top 
of the first radial pieces, 4 millimeters; height from base of the calyx 
to the extremities of the arms, 35 millimeters. ; 
This species resembles S. equalis Hall, as figured in volume v of the 
Illinois Ceological Reports, more nearly than any other known to me, 
but it differs from that species inthe much greater proportionate length 
of the arms, as well as their number and the manner of their bifurcation, 
besides the difference in the character of thesurface. A conspicuous dif- 
11H 
